#define _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
int my_strlen(char* s)
{
	char* start = s;
	while (*++s);
	
	return s - start;
}
int main()
{
	char arr[] = "abcdef";
	int len = my_strlen(arr);
	printf("%d", len);
}